The Battle of Węgierska Górka was a two-day-long defence of a Polish fortified area in south of Silesia during the opening stages of the Invasion of Poland of 1939. Although the Polish position was not completed and only five bunkers were manned, the line was defended for two days and nights against superior German forces of the German 7th Infantry Division. One of the bunkers was successfully evacuated by the Polish 1st Mountain Brigade, but the others lacked radio receivers and did not receive the order to retreat. Eventually, the Germans managed to break through the Polish positions, but with heavy casualties on their side and with a significant delay. History Before the battle Following the German occupation of Czechoslovakia, Poland's southern border became vulnerable to a possible German invasion. Because of that, in April 1939 the General Inspectorate of the Armed Forces dispatched Col. Tadeusz Zieleniewski to prepare plans of fortifications along the border to cover the southern flank of the Kraków Army in case of an armed conflict with Nazi Germany. The plan assumed creation of four major fortified areas sealing all four river valleys in the area. The Soła valley was to be blocked by 20 large bunkers located around the village of Węgierska Górka, the Koszarawa was to be sealed in Korbielów, Krzyżowa and Przyborów, the Skawa shielded in Bystra and Jordanów, while the Raba River valley was to be defended by bunkers built in Raba Niżna. The plan was accepted on 24 June and the construction at Węgierska Górka and Korbielów started almost immediately, in early July. The bunkers around Węgierska Górka were to form a crescent-shaped defensive position guarding the village and the town in the valley between the hills of over 1000 metres of altitude. All works were carried out by a mobilized unit of Work Battalions led by Major Śliwiński, with civilians forbidden to enter the construction area. The bunkers were of different types, but all of them were large, able to house at least one anti-tank gun, several heavy machine guns and a crew of up to 20 soldiers. The walls and ceilings were made of reinforced concrete mixed with dense porphyry rocks, which added to their impregnability. All bunkers in the area had code-names starting with the letter W. Despite the plans, in less than two months only five bunkers were more or less ready. On 1 September 1939, at